Here we look at how blood transfusions started as an experiment four centuries ago, and became the modern-day life saver they are.

We know blood is vital for life, do we know why?
Illuminations: Blood Equality by Jordan Eagles (USA) Image credit: David Meanix and courtesy of artist as part of Science Gallery Melbourne’s BLOOD exhibition
July 25, 2017

Weight loss often leads to declines in our resting metabolic rate – how many calories we burn at rest – which makes it hard to keep the weight off. So why does weight loss make resting metabolism go down?